Necessary enhancements in Cura / Eperimental / Wipe Nozzle)

[stf 2]

I use the 3D printer "anycubic-predator":
https://www.anycubic.com/products/anycubic-predator-fdm-printer

 

The filament is PETG. That doesn't mean warping. However, after a while the nozzle sticks. Which unfortunately slowly but surely destroys the part!
A cleaning brush cannot be attached to the X-axis of the delta printer. Further optional input values are required (shown in red in the picture):
1. additionally required: Y absolute
2. additionally required: Z absolute
This gives an absolute starting position X-Y-Z for the wipe move (shown in yellow in the picture).

 

Avoid collisions between the nozzle and the printed part: 

If the part to be printed plus "Wipe Z Hope Height" is higher than the entered Z value, cleaning should no longer be carried out.

However, cleaning should be carried out before it is exceeded.

 

I think these enhancements are important for users of delta printers.

Cartesian 3D printers also require an additional axis (X or Y).

 

What is your opinion?

 

 

 

 

 

Gehaeuse Temp-Steuerung.3mf

 

Edited September 14, 2020 by stf

[gr5 2,224]

I had to read your post a few times to understand so I think I'll summarize your request:

 

The current "wipe" feature is very limited.  On Ultimaker printers, the head doesn't move up and down so it's easy to mount a wipe brush at a fixed Z that spans one whole side of the printer.

 

On many other printers, including delta, the nozzle moves up and down, not the bed.  So you need a Z position.

 

PLEASE IMPROVE WIPE TO ADD:

X,Y,Z POSITION (not just X)

 

[stf 2]

That is correct. 

My day-long attempts with different parameters could not prevent the nozzle from sticking with somewhat larger parts!  With PETG, the only thing left is the automatic repeated cleaning of the nozzle, even in between.

[gr5 2,224]

To clarify - I don't work for Ultimaker and I've never edited Cura.  I was clarifying for other readers who have worked on Cura but with the forum it is hit or miss.  There's just too many posts every day to follow them all.  I'll grab the attention of 2 people who *don't* work for Ultimaker but have contributed (for free).  One is  @ahoeben

 

One of them, @burtoogle, even owns a delta printer so maybe he has the same issue as you with PETG stringing.  It might help/motivate people to write this option into Cura if you showed a photo of your wipe brush/device.  In theory it could be very low down or quite high up on the printer I suppose?

 

I have printed about 3 spools of PETG this past summer and haven't noticed much stringing and never noticed any brown glob drops into the print.

 

@stf note that you get much more attention if you log an "issue" on the github tracker.  You have to create an account with github (everyone on the planet should get one as it's handy and free).  Then go here:

https://github.com/Ultimaker/Cura/issues

 

Try to be clear and succinct.  Include the photos above.  Explain clearly that there is an X position for wipe but there needs to be an x,y, and z position.  I'm worried that if it just moves to the position it will come up or down at the brush in such an angle that it will either miss it completely (heading down to the brush) or smack into the brush holder (coming up to the brush).  A photo of your wipe device would be helpful.

 

Again - the person who wrote this feature was thinking that the brush would not move in Z relative to the nozzle.  This is true of very many printers.

[stf 2]

Hello gr5, thanks for your guidance.
I created a new problem in GitHub.

[gr5 2,224]

Please link to it from here so other's with the same issue can read up on progress/discussion and can chime in over on github.

 

[stf 2]

Here is the link to GitHub:

https://github.com/Ultimaker/Cura/issues/8408